Rotary pump.



W. H. WEDDINGTON.

ROTARY PUMP.

APPLICATION FILED MAR.9, 1911.

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ROTARY PUMP.

APPLICATION FILED MARS. 1911.

2 SHEETS-SHEET 2.

I Iruvenizor: ZULLLLa/m Jdllle Patented May 21, 1912.

ness 1 W WILLIAM E.-WED 1) LNGTON,.0F LANKERSHIM, CALIFORNIA.

ROTARY IUMP.

Application filed March 9, 1911.

Specification of Letters Patent.

PatcntedjMuy 21.. 1912.

Serial No. 6133681.

- Pumps, of which the following is a specification.

This invention relates to improvements in rotary pumps and it is the object of the invention among other things to provide a pump having rotary pistons arrangeilhto balance each other and rotary valves operating in conjunction therewith so arranged as to balance each other, the n'icchanism thus being adapted to operate with a minimum of friction.

It is also an object of the invention to provide a rotary pump in which a plurality of balancing pistons are en'iployed and a plurality of cooperating abutments together with means tor hibricating the shafting of said pistons and ahut-ments.

In the accompanying drawing forming a part of thisspecilication, Figure 1 a top plan yiew oi the improved rotary pump mcchanism, portions oi the some being taken away and shown in central. section. Fig. 2 is a side elevation of the said pump. Fig. 3 is a transverse sectional central view through the piston of the pump, the casing therefor being shown in end. elevation. Fig. 4 is a. detail sectional view taken, upon the line 4.--4. of Fig. 1'.

The features of this invention will now he more particularly described, reference being had to the accompanying: drawing; in which 5 indicates a central piston casing. (S and 7 outer casings mounted end to cud with respect to the'central casing. S a central piston and 9 and 10 outer pistons ci'iiipcrating therewith Y The casings (l and 7 are separated from the casing 5 by means of partition plalcs or walls 11. and i2 which are nuulc to fit hctuecn the same and may he held in place by any suitable means when the parts are connected together. The outer ends of the casings (5 and 7 are provided with heads 1 and 14- which are ti g htl drawn together for clamping the casing D, G and '7 and the partitions 11 and 12 in place, bolts as 15 heme Any rcqu ired employed for this purpose.

and placed at numhcr of bolts l? are used the outer nearer pistons suitable intervals around the outside of the casings 5, 6 and 7 as clearly indicated in Figs. 2 and 3.-

Extending centrally through the pump is the hollow shaft 16 to which is securely fus tcncd the pistons S, 9 and 10. The said hollow shaft. finds hearings in the hearing casings 17 and 13 secured to the opposite ends of the pump, t-hc'said casing having flanges 19 and 90 hy which they may be securely bolted to theends iji and l-l.

lhc casing 5 islnot only provided with the cylindrical central-portion closely [ilting upon the piston 8 hut is provided with lateral enlarged portions having inner faces -forming parts of cylinders for receiving; rollers or ahutmcnts Q1. and 22 which onoperate with the piston 8 in "its operation. The casings (l and 7 are also formed with' corrcspondiugly enlarged portions for re' cciving rolle' ahutmcnts 23. 23, 527 and 2t) 7 which cooperate with the pistons 9 and ll). The piston ."l is formed with a cent at huh portion 27 having an inlet. port 28 and an outlet port 529 iormed therein. the said ports lacing arrangci'l upon the oprmsil'c sides oi a piston hard 30. The said piston head 0 is flared outwardly at its outer end and made to fit snugly the inner surface of the casino 5 as will he apparent from reference to l ig'.

3. The roller ahulmcnts '21 and 2; are also 86 provided with depressions ill and 32 adapted to accommodate the movement ol the piston head 30 wliciu-vcr it passes opposite to said roller.ahutments. The shape oi the interlocitim; portions of the rollc idiulmcnts 90 and the piston head is such as to maintain a rh'sc joint lwtwccn the. said piston and the said roller .ihutments during; the entire revolution ol' the piston. 'lhc pistons J and it) are likewise providrd with proje c iing pisl on heads Eli) and Ill made similar to the piston head i l and the roller lliflliitltlllr "3 ill, 15 and it? are also formed with depressions similar to the depressions I-'l and It) for accommodalinp; the passage of the piston heads 3?) and H in the rotmiou oi the parts. The said pistons 9 and ll) with their cooperating rollc' ahulmcnts are preferably made exactly hall the length of the piston 8 with its roller ahutments so that the pres- 106 sure exerted in the pumping operation by J and ill will exactly equal and balance the pressurc e.\'-

erted by the inner Wide -piston 84 The action of; the pistons is thus "balanced and there is practically no friction brought upon the shafh which carries them. 1 The roller abutmentslars also balanced in the same way so that t-he ifiare not productive-of friction in their action in coiiperating with the pistons. f

Flince the than of -each piston as 8 is pro dactive of eitl eitrpressure or suction against,

one side only of the roller abutments opposite thereto "and is desirable to equalize such pressure eat; of the roller abut-ments is provided opposit v e to the depressions 31 and 32 therein. WltllliI'QGESStlS or passageways 3501 36 which provided with ports and 33 at their opposite ex'tr mities and the casings of the said roller, abutments are formed in their inner. surfaces withcooperthat a pressure or suction may be communicated to the outer' sides of the roller abut} mentsto equal the pressure or suctionto which the inner sides of. said abut-merits are subjected. In order that the pressure or suctigln may thus be communicated to the outer'sides of the roller abutments small ducts, 41 and 42 are arranged in the casing to establishcommunication between "the'cylinder 5 and the" passages and 36 formed in the said rollerabutments', and

through them to the recesses 39 and befhind the abutmentsn The ressure is thus itbsolutely equalized aroun the said roller abutuients' so that there is practically no friction upon the bearings which support the 3 said abutments. The said roller abutments 21, 23 and 25 are carried by a shaft 43 while the roller abutments 22 24 and 26 are carried by a shaft, 44. The shafts 43 and 44 extend parallel to the shaft 16 and are mounted in bearings formed in the heads 17 and 18 of the pump casing; The ends of the said shafts are provided with packing glands asindicated at 45 and 46 in Fig. 1. These glands are held in place by adjustable heads 47 and 43 .which screw into the ends of the bearing casing 17 and 13v as shown in Fig. 1. The inner edges of these heads bear upon packing material. for holding it tightly around the shafts and near their inner ends, each of the said heads 47 and 48 is provided with one or more apertures as 49 for permitting lubricants to reach the shaft within. The heads 47 and ,48 are also preferably formed opposite the apertures 49 with annular grooves as 50 opposite the apertures 49 so that, the lubricant can travel. entirely around tholieads4i and 48 and can enter either of the opening 49 provided therein. The shaftfllfi iisalso provided with similar stuflingboii l l first 51, the thu'eaded sleeve of which is formed with apertures 52 to permit the'lubricant amp yed to reach the shaft. The said'slecvc is also provided wilh an anating recesses. ordepressions 39 and 4.0, so

nular passage or groove- 53 opposite the v apertures 52 so as to supply oil or lubrica to all of them entirely around the bearing. The casings 17 and 18 are provided with lubricant receiving openings as 54 which lead into transverse connecting passages 55 as indicated in Figs; 1 and 4. Any desired oil caps or lubricating devices may be screwed into the opening 54 for supplying foil or other suitable lubrieantto the several 'bearings. The lubricant will be fed in pp-- posite directions in the passages 55 so that both the shafts 43 and 44 as well as the shaft 16 will be'properly lubricated. p, The abutments" 21, 22, 23, 24, 25" and 26 80 are all caused to move in exact and proper relation to the pistons 8; 9 and 10 by means of intermeshing gears as 56, 57 and 58, the gear158 being indicated in dotted lines only iii" Fig. 1. These. gears are readily l eyed upon their respective shafts. and are all the same size so that for every complete revolu-- tion of the pistons upon the shaft 16- the roller abutments carried, the shafts .43 and 44 will also make a complete revolutionJ The shaft 16 is provided at a point beyond the bearing thereof in the c sing 18; with'a series of ports 60 which inclosed in. a casing or housing 61 surrounding the shaft 9 v16 at this point, the aid housing 61 having]: upon one side an int ct pipe 62. The outer v end of the shaft 16 is closed by an extension shaft portion 63 which is tightly screwed into the end of the shaft 16 as will be readily understood by reference to Fig. 2. i The materials drawn into this pump byits operation may thus enter through the in? let pipe 62 and the ports 60 in the shaft l6v The materials pumped then pass through the shaft 16 toward the-pistons of the'pum'p' lVithin the said shaft is fastened a central sleeve (55 which is provided with elongated passage .vays as 66 and (i7 and other pass 4; ways 68 and69. The passage-way 66 isopen 110 at the end thereof next to the inlet ports of the shaft while its other end is cl'o'sedll The passages 66 and 67 are thus in ppsition to cooperate with the ports28 and-296i t piston 8 while as shown in Fig. 3 the sageways 68 and 69 are adapted to common cate with similar ports in the pistons 9 and 10 as indicated in dotted lines In Fig. 3. r The passageway 67 is closed at the en, adjacent to the ports 60 While its other'cnd' is opened so that as the piston 8. rotates the H material to be pumped will be drawninto" the casing of the piston through the passageway (36 and the port 28, the movement of the piston being as indicated by arrowsfin- Fig. 3. A. continued rotation of the piston will also force the material drawn into its casing, outwardly through the port 29 and I the passageway 67 into the shaft 16 again at the opposite end of the pump from the inlet m pipe 62. The material pumped may be con-- ducted from the end of the shaft '16 in any preferred or desired manner.

While the piston 8 is drawing materials as just described throughone set of pa; ways in the sleeve 65, the other pistons t.) and 10 will also be pumping materials through thepassa-geways (38 and 9 their action being thus arranged to exactly balance the action of the piston 8. The puu'lping action prodiuzed'lrv these pistons is of course against the surfaces of the cooperating rotating abutirncnts ill to .36.

The operation of the pump has been partially described with reference to the description of, the parts and will be readily understood.

The pump is operated preferably by rt tatingthe shaft l6 which is generally ac coniplished by a pulley secured to the solid extension of said shaft- 63, the said pulley not being shown. The pulley is of course zonnected with any desired or suitable source of power for rotating the shaft 16. The rotation of said shaft ll) carries with it the pistons 8, 9 and 10 and the cooperating abutments 21 to 26 which are actuated in correspondence therewith through the agency of the internieshing gt-iars 56, 57 and 3S and material to the hollow shaft it? the shafts 43 and l-l. The action of the piston heads 30 33 and within the piston casings is such as to force the materials Within the pump outwardly through the passageways 67 and (39 as l'ieretofore described, a suction being: thus caused to draw in more from the inlet 62 and through the passageways tltl and 68;, The pump action is practirxill y contimr- "oils because of the exact fitting of the roller ahutnrents upon the parts of the pistons and their acconunodation to the passage of the piston heads 30 33 and The outer oppositely acting pistons t) and 10 outside the piston 8, the combined. capacity of which exactly equals the capacity of the piston produce an exactly balanced condition in the pumping operation performed by the said pistons, and the introduction of the pi maintained Within the pump, behind the roller abutments as heretofmc 'desvrilmt, also decreases any friction or P11551111? upon the said ab'utments in their action and all the moving parts of the pump are thus thoroughly and perfectly balanced whereby friction at any point is practically eliminated. Not only is the pump effective in producing the pumpinp action but: it is also capable of being rotated with a minimum amount of friction. The lubrication of the parts while simple is eti'ective and the luhricant must reach all of the bearings of the pump. l

W hat I claim is:

l. A pump comprising a hollow shaft.

ion pistons tfittlttl thereby, and having;

piston heads, the piston heads of alternate 'iistons extending diametrically in opposite direct-Elms with respect to each other,the said pistons having ports upon each side of the piston heads communicating with the interior of the hollow shaft and eot' peratiug roller abutments adapted to have the pres sure or suction of the pump equally dis tributed about them whereby friction in the parts of the pump is largely eliminated.

ii. a rotary pump comprising a hollow shaft, aplurality of pistons remlviup, therewith, and having projecting' the said pistons having outlet and inlet ports upon each side of the said heads eommunieating with the interior of the said hollow shaft, roller abutments disposed at the sides of the pistons and adapted to roll upon the hubs thereof, the said roller abutments having depressions in their surfaces to permit the piston heads to pass them, and means with in the shaft for directing the ,materials to the pistons suecessivelyl A rotary pump comprising a casing, a hollow rotary piston mounted in said casing and having a projecting piston head, the

said piston having ports on each side of said.

head communicating with the interior of the piston, a tubular shaft carrying the piston and having inlet and outlet ports opposite to the ports of the piston, means for permitting of the iullow of materials pumped to said ports, and means for receiving the dis charge of materials from the same.

4. A pump comprisimga hollow shaft, a piston mounted thereon narvinp; a pumping piston head, other pistons mounted outside the said pist on and provided with pumping heads, the combined capacity of the outer pistons being equal to the capacity of the inner pistons, and roller ahutmcnts cooperating with the pistons for facilitating their pmnping materials through the said hollow shaft.

A rotary pump comprising a hollow shaft having inlet and outlet ports therein for directing the passage of the fluids pumped, pistons mounted upon the said shaft and having induction and eduction ports c1nnmuuicating with the "inlet and out.- tet l mes tics of the hollow shaft, roller abut-- ments disposed at the sides of the pistons and having capacities corresponding to the (:lliutlilUl-T of the pistons opposite which they operate, and means for causing, the said abutmcnts to operate simultaneously with the pistons.

6. A pump mechanism comprising a cas- "iugr having central piston casings and outer abutment casings formed therein, a shaftextending through the pistons and having intake and exhaust passages arranged therein, and comnmnicating with intake and exhaust ports in the said pistons, movable abutments n-atimg with the pistons, and provided opening in opposite directions and capa with spaces opposite to the pistons for receiving pressure equal to the pressure Within the piston casings whereby the action of the abutlnent-s is completely balanced.

7. A pumpingmechanism comprisin a ,eyjlinder easi'i'ip; having, central cyl'.1 .ers formed therein, and outside cylinders arranged upon each end thereof, a pump pi."- ton occupying the central cylinder, other pump pistons occupying the outer cylinders, each of said pistons having radial project 'ing piston heads, the piston head, of the innor piston projecting diametrically opposite to the piston heads of the outer pistons, cooperating roller abutments arranged in the cylinder casing upon opposite sides of the piston cylinders and adapted to fit upon the surface of the pistons, the said casings being provided with recesses extending partiallyaround the roller abutmcnts, and having passages leading thereto from the. piston cylinders, the roller abutments being also providcd with passages for insuring the delivery of pressure from the piston cylinders. to the recesses beyond the roller abntments, and means for operating the roller abutments in correspondence with the movement of the pistons.

8. A pump mechanism comprising hollow pistons, a, hollow shaft extending through the same and adapted to have the materials pumped forced longitudinally of said shaft, rotary abutments operating in-conjnnction with. the rotary pistons, the said pump being provided with means for directing the) pressure from the piston cylinders around the said roller abutments, and means within the hollow shaft for directing the materials pumped by the pistons.

40 9. A pump mechanism comprising a holglow pump shaft, a central piston, and outer balancing pistons mounted upon said shaft, and having ports communicating with. the interior of said shaft, the combined capacity of the outer, pistons equaling that of the centrally arranged piston, piston heads arranged to direct the materials pumped thron -h the orts of said )istons cooeratng roller abut-merits having the same relative proportions asthe relative proportions of the piston, the said roller ahutments be ing also provided with means for admitting equalizing pressure behind them from the piston casings whereby. the pistons and the rollerabutments of the pump will balance each, other andoperate with a minimum of' frietioni i fiOqA pump mechanism, comprising a hollow shaft, rotaryjvpistons carried thereby,

interior, of said shaft, a member mounted within the I hollow shaft having passaggilss,

"of diricting the inflow and outflowv of'ma- 65 terials pumped thronghithe said-shaft, and

and having, ports communicatingwith the abutments in correspondenc roller abutments arranged opposite the pistons for accommodating themselves to the movement of the pistons and facilitating the pumping action thereof. I

ll. A rotary pump mechanism having cy inclers, comprising a casing having bearings formed therein f or shutting, and having cylindrical casings, a central pump shalt extending through the casing, a piston mounted thereon having piston heads projecting in opposite directions, the said pistons having inlet and outlet ports formed upon the opposite sides of the piston heads and eomn'iunicating with the interior of said. Hollow shaft, a fluid directing member mounted within th hollow shaft and lmv'ing elongated passages formed therein and (531-- tending opposite the ports of the pistons, the passages which are opposite the inhitv ports of the pistons-being closed at one end while the passages opposite the outlet ports of the pistons are elosed'at the opposite end whereby the materials will be forced to through said hollow shaft, roller ahutment-s coo 'ierating with the pistons and facilitating their action, bearings for the shafts and the roller abutments, the casing having in ter-com'leetine passages for directing lubricating material to all of said bearings.

12. A pumping mechanism comprising a casing, a hollow pump shaft extending through the same, hollow pistons n'iounted thereon and having ports connnunic "up; with the interior of the shaft, a fluid d noting member mounted Within the shall and communicating with said ports for directing the materials pumped, roller ahutmei'its cooperating with the pistons, hearings in the said casings for the said hollow shaft and the shafts of the roller abutments, and ad:

'justing means for maintaining"- all of said shafts properly centered and in true alinement. v

13. A pump mechanism comprising a hollow shaft having ports formed therein opposite an inlet, the said shaft also havint: a sleeve mounted within the same which provided with inlet and outlet passages the inlet passages being open near the inlet ports of the shaft while the outlet passages are open at their opposite ends, pistons mounted upon the said hollow shaft and having induetion and eduction portsjcommnnicating wlith the inlet and putlet pamages of the sleeve in the said shathfroller abutnients cooperating with the pistons for, maintaining the proper pressure jt ithi-n the device, and

'yet aeconmiodating the movementjof the pistons, and means tor in meat we I

'piston heads oppositely arranged with respect to each othcryeach. piston having induction and eduotion ports urrangod'upon opposite sides of the piston heads, and communicating wih the interior of the shaft, 11

sleeve .rnounhod irl the shaft and having inlet; passages auiinged oppgmito tho induction ports of the pistons and outlot passages extending opposite the oduction ports of the pistons, roller abutments mounted adjacent to the pistons and cooperating therewith, intermeshing gears ofthe same diai'noter for moving the roller abutn'wnts in exact correspondence with the movement. of the pi$- tons, and means for rotating the hollow shaft for operating all the parts of the pump.

In witnesps that I Claim the foregoing I have hereunto subscribed my name this 27th day of February, 1911.

W. II. WVEDDING'ION.

YVitnessos:

CASSHBL SEVERANCE, EARLE R. PoLLAm); 

